Implement ISOSDacInterface::GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps in cDAC SOSDacImpl by Copilot · Pull Request #124818 · dotnet/runtime

Copilot · 2026-02-24T20:24:35Z

Description

Implements ISOSDacInterface13.GetLoaderAllocatorHeapNames and ISOSDacInterface13.GetLoaderAllocatorHeaps in the managed cDAC SOSDacImpl.cs, replacing the legacy DAC delegation stubs. Based on ClrDataAccess::GetLoaderAllocatorHeapNames and ClrDataAccess::GetLoaderAllocatorHeaps in request.cpp.

Native Data Descriptors

Added heap fields to cdac_data<LoaderAllocator> in loaderallocator.hpp: StaticsHeap, ExecutableHeap, FixupPrecodeHeap (#ifdef HAS_FIXUP_PRECODE), NewStubPrecodeHeap (#ifndef FEATURE_PORTABLE_ENTRYPOINTS), DynamicHelpersStubHeap (FEATURE_READYTORUN && FEATURE_STUBPRECODE_DYNAMIC_HELPERS), VirtualCallStubManager
Added new cdac_data<VirtualCallStubManager> in virtualcallstub.h: IndcellHeap (unconditional), CacheEntryHeap (#ifdef FEATURE_VIRTUAL_STUB_DISPATCH)
Added corresponding entries to datadescriptor.inc with matching feature guards
Added VirtualCallStubManager to DataType enum
Added #include "virtualcallstub.h" to datadescriptor.h so cdac_data<VirtualCallStubManager> is visible when datadescriptor.inc is compiled

Managed Data Classes

Updated Data/LoaderAllocator.cs with optional heap fields (FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap as nullable) and always-present fields (StaticsHeap, ExecutableHeap, VirtualCallStubManager)
Created Data/VirtualCallStubManager.cs with IndcellHeap and optional CacheEntryHeap

ILoader Contract

Added single GetLoaderAllocatorHeaps(TargetPointer) method to ILoader interface returning IReadOnlyDictionary<string, TargetPointer> — dictionary keys are heap names, values are heap pointers
Implemented in Loader_1.cs with dynamic dictionary building based on data descriptor field presence via ContainsKey checks, matching the native #ifdef conditional compilation
Dictionary keys use nameof(Data.LoaderAllocator.X) and nameof(Data.VirtualCallStubManager.X) instead of hardcoded strings
Feature-conditional heaps (FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap) are only included when the data descriptor field exists
VirtualCallStubManager heaps (IndcellHeap, CacheEntryHeap) are excluded entirely when VirtualCallStubManager is null

SOSDacImpl

GetLoaderAllocatorHeapNames: Queries global loader allocator via ILoader.GetLoaderAllocatorHeaps to get heap names from dictionary keys. Lazily initializes ANSI string pointers via Marshal.StringToHGlobalAnsi, cached on the instance. Standard cDAC pattern with try/catch, S_FALSE when buffer is insufficient
GetLoaderAllocatorHeaps: Reads heap pointers through the ILoader contract dictionary, fills LoaderHeapKindNormal for all heaps
Both methods include #if DEBUG validation blocks that compare cDAC results against legacy DAC output — heap name strings and heap pointer/kind values are validated to match, following the pattern used by other cDAC APIs

Contract Documentation

Updated docs/design/datacontracts/Loader.md with:
- New GetLoaderAllocatorHeaps API in the contract API section
- New data descriptor fields for LoaderAllocator (StaticsHeap, ExecutableHeap, FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap, VirtualCallStubManager) and new VirtualCallStubManager type (IndcellHeap, CacheEntryHeap) in the data descriptors table
- Pseudocode implementation showing feature-conditional dictionary building logic

Tests

8 test methods in LoaderTests.cs × 4 architectures = 32 new test cases
- GetLoaderAllocatorHeapNames: Count query, full name retrieval, insufficient buffer, null pNeeded
- GetLoaderAllocatorHeaps: Count query, full heap retrieval, insufficient buffer, null address
All 900 cDAC tests pass

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Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/SOSDacImpl.cs

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max-charlamb · 2026-02-24T21:18:01Z

@copilot, try again

…dd missing using Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Copilot · 2026-02-24T21:29:19Z

@copilot, try again

Implementation reworked in commits up to 0554c43. Changes:

Feature-conditional heap names: GetLoaderAllocatorHeapNames in Loader_1.cs dynamically builds the names list by checking ContainsKey on the data descriptor fields - DynamicHelpersStubHeap is conditional on FEATURE_READYTORUN && FEATURE_STUBPRECODE_DYNAMIC_HELPERS, and CacheEntryHeap is conditional on FEATURE_VIRTUAL_STUB_DISPATCH, matching the native LoaderAllocatorLoaderHeapNames array.

GetLoaderAllocatorHeaps: Fully implemented in SOSDacImpl.cs, reading heap pointers through the ILoader contract. The contract reads from LoaderAllocator and VirtualCallStubManager data classes, handling null VcsManager by padding with TargetPointer.Null.

Native data descriptors: Added cdac_data<LoaderAllocator> fields (StaticsHeap, ExecutableHeap, FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap, VirtualCallStubManager) and new cdac_data<VirtualCallStubManager> (IndcellHeap, CacheEntryHeap) in loaderallocator.hpp, virtualcallstub.h, and datadescriptor.inc.

Tests: 32 new test cases (8 test methods × 4 architectures) covering both methods. All 864 cDAC tests pass.

max-charlamb

@copilot , address feedback

...tive/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ILoader.cs

…ps API Replace separate GetLoaderAllocatorHeapNames() and GetLoaderAllocatorHeaps(TargetPointer) with a single GetLoaderAllocatorHeaps(TargetPointer) returning IReadOnlyDictionary<string, TargetPointer>. SOSDacImpl.GetLoaderAllocatorHeapNames now queries the global loader allocator to get names from the dictionary. GetLoaderAllocatorHeaps iterates dictionary values. Tests updated to use dictionary-based mock and verify unordered name/address sets. Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

max-charlamb

@copilot , address feedback

...native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/Loader_1.cs

…tionary - Use nameof(Data.LoaderAllocator.X) instead of hardcoded strings for all dictionary keys in GetLoaderAllocatorHeaps - Make FixupPrecodeHeap and NewStubPrecodeHeap conditional on ContainsKey (exclude from dictionary when field absent from data descriptor) - Remove else branch that padded IndcellHeap/CacheEntryHeap with null when VirtualCallStubManager is null - only include them when VcsManager exists - All 864 cDAC tests pass Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Copilot · 2026-02-24T22:05:53Z

@copilot , address feedback

Addressed all three review comments in e0e9cd5 — nameof for dict keys, conditional inclusion for FixupPrecodeHeap/NewStubPrecodeHeap, and no null-padding for VcsManager heaps. All 864 tests pass.

@copilot, try again

Addressed all three review comments in e0e9cd5 — nameof for dict keys, conditional inclusion for FixupPrecodeHeap/NewStubPrecodeHeap, and no null-padding for VcsManager heaps. All 864 tests pass.

max-charlamb · 2026-02-24T22:37:27Z

@copilot , please fix build break

datadescriptor.h did not include virtualcallstub.h, so the cdac_data<VirtualCallStubManager> template specialization was not visible when datadescriptor.inc was compiled. This caused a build failure referencing cdac_data<VirtualCallStubManager>::IndcellHeap and cdac_data<VirtualCallStubManager>::CacheEntryHeap. Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Copilot · 2026-02-24T22:46:39Z

@copilot , please fix build break

Fixed in 3f63f2f. The issue was that datadescriptor.h did not include virtualcallstub.h, so cdac_data<VirtualCallStubManager> was not visible when datadescriptor.inc was compiled. Added #include "virtualcallstub.h" to datadescriptor.h.

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...tive/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ILoader.cs

…names

max-charlamb · 2026-02-25T14:53:05Z

@copilot, address feedback from Noah. We should document any new datadescriptors and APIs in the relevant cDAC markdown file.

Add documentation for the new ILoader.GetLoaderAllocatorHeaps API, including: - New API in the contract API section - New data descriptor fields for LoaderAllocator (StaticsHeap, ExecutableHeap, FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap, VirtualCallStubManager) and VirtualCallStubManager (IndcellHeap, CacheEntryHeap) in the data descriptors table - Pseudocode implementation showing feature-conditional dictionary building Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

…nager and PortableEntryPoint Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Copilot · 2026-02-25T15:03:26Z

@copilot, address feedback from Noah. We should document any new datadescriptors and APIs in the relevant cDAC markdown file.

Documented in ab7f065. Added to docs/design/datacontracts/Loader.md:

GetLoaderAllocatorHeaps API in the contract API section
New LoaderAllocator data descriptor fields (StaticsHeap, ExecutableHeap, FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap, VirtualCallStubManager) and new VirtualCallStubManager type (IndcellHeap, CacheEntryHeap) in the data descriptors table
Pseudocode implementation showing feature-conditional dictionary building

Also resolved a merge conflict in DataType.cs in a54d098 (both VirtualCallStubManager and PortableEntryPoint needed). All 900 cDAC tests pass.

max-charlamb

@copilot , address feedback

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/SOSDacImpl.cs

…AllocatorHeaps Expand #if DEBUG validation blocks to compare actual name strings and heap pointer/kind values between cDAC and legacy DAC, following the pattern used by GetAssemblyList and GetMethodsWithProfilerModifiedIL. Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Copilot · 2026-02-25T18:17:31Z

@copilot , address feedback

Addressed in 2c1ed8a. Both GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps now validate actual names and heap pointer/kind values against the legacy DAC in the #if DEBUG blocks. All 900 tests pass.

Copilot

Pull request overview

This PR implements ISOSDacInterface13.GetLoaderAllocatorHeapNames and ISOSDacInterface13.GetLoaderAllocatorHeaps in the managed cDAC, replacing legacy DAC delegation stubs. The implementation adds native data descriptors for loader allocator heaps and VirtualCallStubManager heaps, creates corresponding managed data classes, extends the ILoader contract, and includes comprehensive tests.

Changes:

Added native data descriptors for LoaderAllocator heaps (StaticsHeap, ExecutableHeap, and feature-conditional heaps) and new VirtualCallStubManager type with heap fields
Implemented GetLoaderAllocatorHeaps in the ILoader contract returning a dictionary of heap names to pointers, with dynamic inclusion based on data descriptor field presence
Implemented SOSDacImpl methods to query heap names and addresses through the ILoader contract, with DEBUG validation against legacy DAC

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/coreclr/vm/loaderallocator.hpp	Added cdac_data fields for StaticsHeap, ExecutableHeap, and feature-conditional heap fields (FixupPrecodeHeap, NewStubPrecodeHeap, DynamicHelpersStubHeap, VirtualCallStubManager)
src/coreclr/vm/virtualcallstub.h	Created cdac_data specialization for VirtualCallStubManager with IndcellHeap and CacheEntryHeap fields
src/coreclr/vm/datadescriptor/datadescriptor.h	Added #include for virtualcallstub.h to expose VirtualCallStubManager data template
src/coreclr/vm/datadescriptor/datadescriptor.inc	Added LoaderAllocator heap fields and new VirtualCallStubManager type with matching feature guards
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/DataType.cs	Added VirtualCallStubManager enum value
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ILoader.cs	Added GetLoaderAllocatorHeaps method to ILoader interface
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Data/LoaderAllocator.cs	Added StaticsHeap, ExecutableHeap, and nullable feature-conditional heap properties, plus VirtualCallStubManager pointer
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Data/VirtualCallStubManager.cs	Created new data class with IndcellHeap and nullable CacheEntryHeap properties
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/Loader_1.cs	Implemented GetLoaderAllocatorHeaps with dictionary building logic that conditionally includes heaps based on data descriptor field presence
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/SOSDacImpl.cs	Implemented GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps with lazy initialization, caching, and DEBUG validation
src/native/managed/cdac/tests/LoaderTests.cs	Added 8 test methods covering count queries, full retrieval, insufficient buffers, and null parameters for both APIs
docs/design/datacontracts/Loader.md	Documented new API, data descriptor fields, and pseudocode implementation

Copilot · 2026-02-25T21:51:23Z

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/SOSDacImpl.cs

+    private nint[]? _loaderAllocatorHeapNamePtrs;
+
+    private nint[] GetOrInitializeHeapNamePtrs()
+    {
+        if (_loaderAllocatorHeapNamePtrs is not null)
+            return _loaderAllocatorHeapNamePtrs;
+
+        Contracts.ILoader contract = _target.Contracts.Loader;
+        TargetPointer globalLoaderAllocator = contract.GetGlobalLoaderAllocator();
+        IReadOnlyDictionary<string, TargetPointer> heaps = contract.GetLoaderAllocatorHeaps(globalLoaderAllocator);
+        nint[] ptrs = new nint[heaps.Count];
+        int i = 0;
+        foreach (string name in heaps.Keys)
+        {
+            ptrs[i++] = Marshal.StringToHGlobalAnsi(name);
+        }
+        _loaderAllocatorHeapNamePtrs = ptrs;
+        return ptrs;
+    }


Memory allocated by Marshal.StringToHGlobalAnsi is never freed, causing a memory leak. The cached _loaderAllocatorHeapNamePtrs array holds unmanaged memory pointers that persist for the lifetime of the SOSDacImpl instance, but there's no cleanup mechanism (no finalizer, IDisposable implementation, or cleanup in Flush method). Consider adding cleanup logic to free the allocated memory, such as implementing IDisposable or adding cleanup to the Flush method.

Copilot · 2026-02-25T21:51:23Z

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/SOSDacImpl.cs

+                    foreach (TargetPointer heap in heaps.Values)
+                    {
+                        pLoaderHeaps[i] = heap.ToClrDataAddress(_target);


Dictionary enumeration order is not guaranteed to be consistent, which causes a critical mismatch between GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps. The native implementation uses a fixed-order static array (LoaderAllocatorLoaderHeapNames in request.cpp lines 3683-3699) that guarantees the heap names at index i correspond to the heap addresses at index i. The cDAC implementation iterates over heaps.Keys in GetLoaderAllocatorHeapNames (line 4475) and heaps.Values in GetLoaderAllocatorHeaps (line 4553), but Dictionary iteration order is not guaranteed to match between Keys and Values enumerations across different API calls or even within the same call in some runtime scenarios. This breaks the API contract where consumers expect names[i] to correspond to heaps[i]. Consider using an ordered collection (e.g., List of KeyValuePair or a custom ordered structure) or ensuring consistent ordering by sorting both Keys and Values by key name.

Suggested change

foreach (TargetPointer heap in heaps.Values)

{

pLoaderHeaps[i] = heap.ToClrDataAddress(_target);

foreach (KeyValuePair<string, TargetPointer> entry in heaps.OrderBy(entry => entry.Key))

{

pLoaderHeaps[i] = entry.Value.ToClrDataAddress(_target);

Copilot · 2026-02-25T21:51:24Z

src/native/managed/cdac/tests/LoaderTests.cs

+    public void GetLoaderAllocatorHeapNames_GetNames(MockTarget.Architecture arch)
+    {
+        ISOSDacInterface13 impl = CreateSOSDacImplForHeapTests(arch);
+
+        int needed;
+        int hr = impl.GetLoaderAllocatorHeapNames(0, null, &needed);
+        Assert.Equal(MockHeapDictionary.Count, needed);
+
+        char** names = stackalloc char*[needed];
+        hr = impl.GetLoaderAllocatorHeapNames(needed, names, &needed);
+
+        Assert.Equal(HResults.S_OK, hr);
+        Assert.Equal(MockHeapDictionary.Count, needed);
+        HashSet<string> expectedNames = new(MockHeapDictionary.Keys);
+        for (int i = 0; i < needed; i++)
+        {
+            string actual = Marshal.PtrToStringAnsi((nint)names[i])!;
+            Assert.Contains(actual, expectedNames);
+        }
+    }


The tests verify that heap names exist in the expected set but don't verify the ordering correspondence between GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps. The legacy DAC contract requires that names[i] corresponds to heaps[i] for the same index i. Consider adding a test that calls both APIs and verifies that the name at each index matches the expected name for the heap address at that index, ensuring the ordering contract is preserved.

Initial plan

d9025a1

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Implement GetLoaderAllocatorHeapNames in SOSDacImpl and add unit tests

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Co-authored-by: max-charlamb <44248479+max-charlamb@users.noreply.github.com>

Remove unused hrLocal variable in DEBUG block

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Copilot AI changed the title ~~[WIP] Implement GetLoaderAllocatorHeapNames in SOSDacImpl.cs~~ Implement ISOSDacInterface::GetLoaderAllocatorHeapNames in cDAC SOSDacImpl Feb 24, 2026

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Changes before error encountered

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Copilot AI changed the title ~~Implement ISOSDacInterface::GetLoaderAllocatorHeapNames in cDAC SOSDacImpl~~ Implement ISOSDacInterface::GetLoaderAllocatorHeapNames and GetLoaderAllocatorHeaps in cDAC SOSDacImpl Feb 24, 2026

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[android][clr] No peer certificates when executing System.Net.Http.Functional.Tests on Android emulator #124526

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Description

Native Data Descriptors

Managed Data Classes

ILoader Contract

SOSDacImpl

Contract Documentation

Tests

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